If we are material beings living in a material world--and all the scientific evidence suggests that we are--then we must find existential meaning, if there is such a thing, in this physical world. We must cast our lot with the natural rather than the supernatural. Many Westerners with spiritual (but not religious) inclinations are attracted to Buddhism--almost as a kind of moral-mental hygiene. But, as Owen Flanagan points out in The Bodhisattva's Brain, Buddhism is hardly naturalistic. Atheistic when it comes to a creator god, Buddhism is otherwise opulently polytheistic, with spirits, protector deities, ghosts, and evil spirits. Its beliefs include karma, rebirth, nirvana, and nonphysical states of mind. What is a nonreligious, materially grounded spiritual seeker to do? In The Bodhisattva's Brain, Flanagan argues that it is possible to subtract the "hocus pocus" from Buddhism and discover a rich, empirically responsible philosophy that could point us to one path of human flourishing. "Buddhism naturalized," as Flanagan constructs it, contains a metaphysics, epistemology, and ethics; it is a fully naturalistic and comprehensive philosophy, compatible with the rest of knowledge.